TWIN FLUE TECHNOLOGY

Designed to go the distance

PDF Twin Flue Technology

8 British Built Since 2013 keston.co.uk 9 Marley muPVC Solvent Weld System (50mm) Marley Code KP 304 50mm x 4m double spigot pipe KP32 50mm x 45 deg bend

TWIN FLUE TECHNOLOGY

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211284-Keston-Product-Guide-2020-March

TWIN FLUE
TECHNOLOGY
Designed to go the distance

www.keston.co.uk |

MADE IN THE
UK
British Built Since 2013

When you choose to work with Keston you can be confident to know that you're partnering with a British manufacturer that's supported by a dedicated national service team, delivering help and advice to you and your customers, 364 days a year.

MADE IN THE
UK

7 YEAR WARRANTY
Providing ultimate reliability, Keston boilers are offered with
warranties of up to 7 years when fitted with a Keston System Filter

TWIN FLUE DESIGN
Providing the perfect solution for problematic and awkward
installations

WEATHER COMPENSATOR
All models in the Keston range come complete with weather
compensation as standard

BRITISH BUILT SINCE 2013
All Keston boilers are built in and designed for
the British market

Image for illustrative purposes only

Keston System and Combi: 5 year parts & labour warranty as standard. 7 year warranty when installed with a Keston 22mm System Filter and registered within 30 days of installation. 7 year warranty available until 31/12/20. Terms and conditions apply. Keston Heat: 2 year parts & labour warranty as standard. 5 year warranty available subject to being commissioned by Keston Boilers. Free Commissioning only available when a Keston 28mm System Filter is installed with a single Keston Heat boiler; not available on multiple (cascade) boiler installations. Terms and conditions apply.

British Built Since 2013

keston.co.uk

CONTENTS

DESIGNED TO WORK WITHOUT COMPROMISE

A KESTON FOR ALL OCCASIONS

TWIN FLUE SYSTEMS

CASCADE INSTALLATIONS

KESTON HEAT 45 & 55

INSTALLATION WITH LOW LOSS HEADER

MULTI BOILER INSTALLATIONS

FRAME AND HEADER KITS

KESTON HEAT - FRAME & HEADER ACCESSORIES

KESTON SYSTEM 30

KESTON COMBI C30 & C35

KESTON SERVICE, SUPPORT & AFTERSALES

KESTON TRAINING

PRODUCT INFORMATION

DESIGNED TO WORK WITHOUT COMPROMISE
When you choose to work with Keston you can be confident that you're partnering with a British manufacturer that's supported by a dedicated national service team, delivering help and advice to you and your customers, 364 days a year.
Our rigorous research & development procedures and manufacturing quality control checks ensures that all of our products are produced to the highest of standards, delivering total comfort and peace of mind.
The Keston Twin Flue system makes every job easier. To give you maximum flue flexibility, you can run the flue vertically or horizontally from an elevation of 1.5° and the flue can be extended up to 27 metres from the boiler allowing for easy and hassle-free installation. This allows the boiler to be sited in the most convenient and practical location.
THE ULTIMATE SIMPLE FLUE SYSTEM
· Flexible flue positioning avoids pluming · Widely available from plumbing and builders merchants · Flue can be painted when installed internally and externally · 50mm muPVC (PVC-C)* solvent weld allowing
simple cost effective installation

British Built Since 2013

* The only systems approved for this application are: Marley muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe System 2000 muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe Terrain Solvent Weld System (50mm) and Wavin Osma PVC-C Solvent Weld System (50mm). Please use the recommended Solvent Weld Cement for each system. Please see page 9 for more details.

keston.co.uk

A KESTON FOR ALL OCCASIONS
The Keston range includes both domestic and light commercial models which come complete with twin flue capability.
Keston boilers are offered with a warranty of up to 7 years, ensuring the ultimate peace of mind for both you and your customer. The Keston range is made up of Combi, Heat only and System boilers, offering a solution for all applications. Every model in the range offers a market leading solution for awkward and problematic installations, thanks to the twin flue capability. You can rest assured when choosing Keston as you will be supported by a national customer service team, offering support 7 days a week.
7
Keston boilers are available with warranties of up to 7 years when a
Keston System Filter is also installed
6

With Keston, your boiler can be situated any room, any place, anywhere no compromise.

WHERE I DON'T WANT THE BOILER IN SIGHT

WHERE THERE IS A LONG DISTANCE FROM BOILER TO OUTLET

British Built Since 2013

Images for illustrative purposes only.
Keston System and Combi: 5 year parts & labour warranty as standard. 7 year warranty when installed with a Keston 22mm System Filter and registered within 30 days of installation. 7 year warranty available until 31/12/20. Terms and conditions apply. Keston Heat: 2 year parts & labour warranty as standard. 5 year warranty available subject to being commissioned by Keston Boilers. Free Commissioning only available when a Keston 28mm System Filter is installed with a single Keston 2 Heat boiler; not available on multiple (cascade) boiler installations. Terms and conditions apply.

keston.co.uk

TWIN FLUE SYSTEMS
The benefits of unique Keston flue systems make every installation easier.
A low cost, small diameter (50mm) muPVC (PVC-C) pipe (Marley, Polypipe 2000 System, Polypipe Terrain 200 and Wavin Osma systems only) is the only item required for use with the innovative Keston flue and air intake system. This is readily available from your local merchant at a fraction of the cost of concentric flue. The Keston flue system makes every job easier. To give you maximum flexibility, you can run the flue vertically or horizontally from an elevation of 1.5°) and the flue can be extended up to 27* metres from the boiler allowing for easy and hassle-free installation.
* For flue fall and maximum total equivalent flue lengths, please refer to each boiler's installation manual.
8

Keston System 27m maximum flue length*
Keston Combi 27m maximum flue length*

APPROVED FLUE PIPE SYSTEMS
When installing a replacement boiler a new flue system is recommended. However re-using the existing boiler flue installation is acceptable if the installer checks and confirms:
· T he flue pipe is the approved Marley/Polypipe/Terrain/Wavin 50mm muPVC (PVC-C) solvent weld flue system
· T he flue installation is upgraded to the most recent flue standards taking particular care to comply with flues in voids regulation
· A risk assessment is conducted to confirm the effectiveness of the flue
· The existing flue will last the lifetime of the new appliance
DESIGN
Individual air supply and flue outlet pipes are used as standard. The material approved for this application which MUST be used are: · Marley muPVC Solvent Weld System (50mm) · Polypipe System 2000 muPVC solvent weld (50mm) · Polypipe Terrain 200 muPVC Solvent Weld System (50mm) · Wavin OSMA PVC-C Solvent Weld System (50mm)
to BS5255 and/or BSEN1566-11 and BSEN1329, are the only systems approved for this application.

Keston Heat 21m maximum flue length*
British Built Since 2013

keston.co.uk

THE FOLLOWING PIPE AND FITTINGS ARE APPROVED:

Marley muPVC Solvent Weld System (50mm)

Marley Code KP 304
KP32 KSC3 KB3 KT3

50mm x 4m double spigot pipe 50mm x 45 deg bend 50mm straight coupling 50mm x 88.5 deg bend 50mm swept tee

Polypipe System 2000 muPVC Solvent Weld System (50mm)

Polypipe Code MU 301 MU 313 MU 314 MU 310 MU 316 MU 316

4m length muPVC wastepipe 5/225
50mm x 45 deg muPVC obtuse bend
50mm x 92.5 deg muPVC swept bend
50mm muPVC straight coupling
50mm muPVC straight coupling
50mm x 92.5 deg muPVC swept tee

Polypipe Terrain Solvent 200 Weld System (50mm)

Polypipe Code 200.2.40 201.2.135 200.2.91 210.2 204.2.135

4m length muPVC wastepipe
50mm x 135 deg muPVC bend
50mm x 91 1/4 deg muPVC swept bend
50mm muPVC straight coupling
50mm muPVC swept tee

Wavin OSMA PVC-C Solvent Weld System (50mm)

Wavin Code 2M073
2M163 2M161 2M104 2M190

3M length waste pipe 50mm 50mm x 45 deg bend 50mm x 87.5 deg bend 50mm double socket 50mm x 8.75 tee

FLUE POSITIONING

Air Terminal
Note: 90 degree elbow must be fitted facing downwards to prevent rain ingress

TERMINATION OF
THE FLUE AND AIR
The flue and air pipes may terminate independently through any external walls within the same dwelling except on opposing walls, within the maximum lengths shown in the graphs on pages 18, 24 and 30 (alternatively a vertical flue pipe termination is acceptable). The air pipe must have an elbow and 150mm length of pipe directed downwards with a termination grill fitted. C13 only, C53 must have a minimum of a 90 degree elbow and terminal fitted facing downwards to prevent rain ingress.
The air pipe can be situated at the side or beneath the flue pipe to a minimum dimension of 140mm (see diagram below). It must not be sited above the flue pipe. The flue and air pipes must extend by at least 40mm from the wall surface. Condensing boilers emit a visible plume of water vapour from the flue terminal, this is normal. It is the responsibility of the installer to judiciously select a terminal location that does not cause a nuisance. If either the flue or air terminal is below a height of 2m from ground level a terminal guard must be fitted.
Note. Any vertical termination MUST comply with C53 installation with the air being taken from greater than 500mm away and from a flat wall termination as diagram in "Flue Positioning".

KESTON FLUE TERMINAL POSITIONS - C13 CLASSIFICATION

Twin Flue Positions when Flue & Air Terminal are less than 500mm apart

Flue minimum spacing

Air minimum spacing

A Below an opening (1)

300mm

50mm

B Above an opening (1)

300mm

50mm

C Horizontally to an opening

300mm

50mm

D Below gutters,soil pipes or drain pipes

75mm

E Below eaves

200mm

50mm

F Below balcony or car port roof

200mm

50mm

G From a vertical drain pipe or soil pipe

150mm

50mm

H From an internal or external corner or to a boundary alongside the terminal (2)

200mm

50mm

I Above ground,roof or balcony level

300mm

100mm

J From a surface or boundary facing the terminal

600mm

100mm

K From a terminal facing a terminal

1200mm

L From an opening in the car port into the building

1200mm

100mm

M Vertically from a terminal on the same wall

1500mm

N Horizontally from a terminal on the same wall

300mm

O From the wall on which the terminal is mounted

40mm

P From a vertical structure on the roof

N/A

Q Above intersection with roof

N/A

(1)

In addition, for temperature and structural reasons, the terminal should not be nearer than 150 mm (fanned draught) to an opening in the building fabric formed for the purpose of accommodating a built-in element such as a window frame

(2)

The reference to external corners does not apply to building protrusions not exceeding 450 mm, such as disused chimneys on external walls for: fanned draught appliances

KESTON FLUE TERMINAL POSITIONS - C53 CLASSIFICATION

Twin Flue Positions when Flue & Air Terminal are more than 500mm apart

Flue minimum spacing

Air minimum spacing

A Below an opening (1)

300mm

50mm

B Above an opening (1)

300mm

50mm

C Horizontally to an opening

300mm

50mm

D Below gutters,soil pipes or drain pipes

75mm

E Below eaves

200mm

50mm

F Below balcony or car port roof

200mm

50mm

G From a vertical drain pipe or soil pipe

150mm

50mm

H From an internal or external corner or to a boundary alongside the terminal (2)

200mm

50mm

I Above ground,roof or balcony level

300mm

100mm

J From a surface or boundary facing the terminal

600mm

100mm

K From a terminal facing a terminal

1200mm

L From an opening in the car port into the building

1200mm

100mm

M Vertically from a terminal on the same wall

1500mm

N Horizontally from a terminal on the same wall

300mm

O From the wall on which the terminal is mounted

40mm

P From a vertical structure on the roof

300mm

N/A

Q Above intersection with roof

150mm

N/A

(1)

(2)

The reference to external corners does not apply to building protrusions not exceeding 450 mm, such as disused chimneys on external walls for: fanned draught appliances

British Built Since 2013

keston.co.uk

SUPPLIED WITH KESTON HEAT
A

SUPPLIED WITH KESTON SYSTEM/COMBI

A. Flue Adapter B. Air Spigot C. Terminals - 2 off

D. Flue Sleeve E. Wall Plate F .Wall Seal

G. Outside sensor H. Screws - 4 off J. Wall Plugs - 4 off

KESTON SYSTEM CONNECTION PACK

Flow Valve Pack

Return Valve Pack

Gas Valve Pack

Accessory Pack

1. Pipe CH Flow 2. Washer CH 3. V alve Flow

1. Screw (x2) 2. Wallplug (x2) 3.Turret Clamp Screw (spare) (x1)

1. Pipe - Gas Inlet 2. Washer - Gas (blue) 3. Gas Cock

KESTON COMBI CONNECTION PACK

DHW Pack

Flow Valve Pack

Return Valve Pack

Filling Loop Pack

A. Gas cock B. Ball Valve - 2 off C. M1 Tee 3/4 D. Pressure Relief Valve E. M1 Tee 1/2

F. Drain Nipple 3/4 G. Drain Nipple 1/2 H. Wall Mounting Plate J. Terminals - 2 off K. Flue Sleeve

L. Wall Plate & Screws M . Wall Seal N. Weather Compensation P. Screws - 4 off Q. Wall Plugs - 4 off

1. 1/2" Top Hat Washer (x2) 2. Cap Female 3. Plug Male and Clip 4. Nut G1/2 16 Brass (Flat) 5. Washer 18.5 x 11 x 11.8 (x2) 6. Pipe DHW Outlet 7. Pipe DHW Inlet 8. Valve DHW Inlet

1. Pipe CH Flow 2. Washer CH 3. V alve Flow
Gas Valve Pack
1. Pipe - Gas Inlet 2. Washer - Gas (blue) 3. Gas Cock

1. Pipe CH Return 2. Washer CH 3. V alve Return
Accessory Pack
1. Screw (x2) 2. Wallplug (x2) 3. T urret Clamp Screw

1. 3/8" Fibre washer 2. Valve Filling Loop 3. Pipe Filling Loop 4. Washer

British Built Since 2013

keston.co.uk

HEAT CASCADE INSTALLATION
The termination of the flue pipes must be a minimum of 140mm apart. There is no minimum spacing required when running flue pipes vertically within the building.

KESTON BOILER RANGE

Air inlet must have elbow and pipe with terminal
14

150mm above intersection of roof vertical flue pipe to have elbow and terminal pointing away from pitch.
If long runs of vertical pipe are utilised, it is recommended to fit a condensate trap at the base of the vertical section (if offset to flue adaptor).
· Air must be taken from vertical wall below roof level
· No minimum separation required between air intakes required
· No fall required for air intake can be horizontal
British Built Since 2013

7 YEAR WARRANTY
Providing ultimate reliability, Keston boilers are offered with warranties of up to 7 years when fitted with a Keston System Filter

TWIN FLUE DESIGN
Providing the perfect solution for problematic and awkward installations

WEATHER COMPENSATOR
All models in the Keston range come complete with weather compensation as standard

BRITISH BUILT SINCE 2013
All Keston boilers are built in and designed for the British market

keston.co.uk

KESTON HEAT
45kW & 55kW Output Natural Gas & LPG
16

The Keston Heat range offers a number of key features that enables ease of installation, maintenance and operation.
Supported by a 5 year parts and labour warranty and Free Commissioning, Keston Heat is a reliable and efficient wall hung solution. The quality of this product range has been developed through meticulous design, careful component selection and proving; leading to reliability and longevity.
The range provides high efficiencies for low running costs with up to 110% part load, seasonal efficiency (ref Building Regs Part L2) up to 97%. The range also provides low NOx emissions at Class 5 and less than 40mg/kWh. Keston Heat provides the perfect solution for a wide variety of commercial installations.
Keston Heat boilers are easy to cascade using our Frame and Header kits, see pages 22-25 for full details. Please note that Free Commissioning is not available on multiple (cascade) boiler installations.

THE FACTS · 5 year warranty · Free Commissioning · Condensing outputs 45 & 55kW · Low NOx Class 5 · Inbuilt weather compensation · Inbuilt pump (low energy
modulating) · Minimum pressure 0.3 bar · Minimum head 3m · Twin flue up to 21m* · High 5:1 turndown · Small installation footprint · 50mm muPVC (PVC-C) solvent
weld flue allowing simple, cost effective installations** · Commercial control system compatibility as standard · British Gas service listed · ECA listed

5
INSTALL THE KESTON 28MM SYSTEM FILTER
with a Keston Heat boiler to receive a 5 year warranty

British Built Since 2013

keston.co.uk

5 YEAR WARRANTY Providing ultimate

reliability, Keston Heat

boilers are offered

with a 5 year warranty

when commissioned

by Keston Boilers

TWIN FLUE DESIGN
Providing the perfect solution for problematic and awkward installations

WEATHER COMPENSATOR All models in the Keston range come complete with weather compensation as standard
FRAME AND HEADER KITS Able to facilitate up to 6 Keston Heat boilers in cascade
MODULATING PUMP Keston Heat boilers come with a low energy modulating pump which complies with energy efficiency requirements
BRITISH BUILT SINCE 2013 All Keston boilers are built in and designed for the British market

2 year parts & labour warranty as standard. 5 year warranty available subject to being commissioned by Keston Boilers. Free Commissioning only available when a Keston 28mm System Filter is installed with a single Keston Heat boiler; not available on multiple (cascade) boiler installations. Terms and conditions apply.* For maximum total equivalent flue length please refer to the installation instructions for full details. ** The only systems approved for this application are: Marley muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe System 2000 muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe Terrain Solvent Weld System (50mm) and Wavin Osma PVC-C Solvent Weld System (50mm). Please use the recommended Solvent Weld Cement for each system.
17

FLUE

INSTALLATION Heat 45

Air Pipe Length [m]

Keston Heat 45 - Flue & Air Pipe Length
35
30
25 NG
20
15
LPG
10

0 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Flue Pipe Length [m]

acceptable flue operating area

3.5° 6m
6m 1.5m
1m
3.5°

C53 HORIZONTAL
Calculations
Flue Elbows 3 x 1m = 3m Straights 4+6+1.5+1 = 12.5m Total = 15m
Air Elbows 2 x 1m = 2m Straights 6+2+0.1m = 8.1m Total = 10.1m

Air Pipe Length [m]

Graph indicates: Natural Gas: maximum flue run 21m with 2m air. Also, 15m flue with 15m air pipe for parallel twin flue run.
LPG: maximum flue run 13m with 1m air. Also, 9.5m flue with 9.5m air pipe for
Heat 55 parallel twin flue run.
Keston Heat 55 - Flue & Air Pipe Length
35
30
NG
25
20
15 LPG
10
5
0 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Flue Pipe Length [m]

Heat 45C13 HORIZONTAL

Calculations

3.5°30

Flue

Elbows 3 x 1m = 3m

Straights 2.5+1.5+3.5+4 = 11.5m

Total = 14.5m

Air

Elbows 4 x 1m = 4m

Straights 2+2+3.5+4+0.15 =

11.65m

0 2

9 1T0o1t1a12l 1=3 11451.56156 m17 18 19 20

acceptable flue operating area

Graph indicates: Natural Gas: maximum flue run 17m with 2m air. Also, 15m flue with 15m air pipe for parallel twin flue run.
LPG: maximum flue run 17m with 1m air. Also, 12.25m flue with 12.25m air pipe for parallel twin flue run.

British Built Since 2013

DIMENSIONS

KESTON HEAT
Height Width Depth

850mm 500mm 360mm

The following minimum clearances must be maintained for operation and servicing. Front of boiler - 450mm* Sides of boiler - 25mm Above boiler - 30mm above the flue Below boiler - 300mm Clearance between multiple boiler installations - 25mm

* Can be reduced to 5mm for cupboard fit, 450mm required for servicing

keston.co.uk

SPECIFICATION

DATA
CENTRAL HEATING

Boiler Output (Non Condensing) Mean 70°C Boiler Output (Condensing) Mean 40°C Boiler Input Net
Boiler Input Gross
Gas Consumption / Rate
Flue Gas Flow Rate
OTHERS

Max
Min
Max
Min
Max Min Max Min Max Max Max Max

kW
kW
kW
kW
kW kW kW kW m3/h ft3/h m3/h ft3/h

45 45P 55 55P 42.6 42.6 52.1 52.1
12.0 12.0 12.0 12.0
45.0 45.0 55.0 55.0
12.7 12.7 12.7 12.7
43.2 43.2 52.7 52.7 12.2 12.2 12.2 12.2 47.9 47.9 58.5 58.5 13.5 13.5 13.5 13.5 4.56 1.78 5.57 2.18 161.2 62.9 196.9 76.8 66.4 64.3 81.0 77.4 2,343 2,271 2,861 2,733

45 45P 55 55P

Efficiency
Seasonal Space Heating Efficiency Class

Seasonal
SEDBUK 2009

NOx

Weighted Classification

96 96 96.7 96.7

% 89.2 89.2 89.6 89.6

mg/ kWh

38.6

43.9

38.3

59.2

ppm DAF

21.9

24.7

21.7

33.3

Class 5 Class 5 Class 5 Class 5

CO2 (±0.5)

Max Min

9.3

9.5 11.2

% 8.4 10.2 8.4 10.2

GENERAL DATA
Max Horizontal Flue Length Max Horizontal Flue Length (Parallel) Flue Terminal Diameter Gas Supply Gas Supply Connection Flow Connection Return Connection Max Pressure (Sealed System) Maximum Static Head Electricity Supply Fuse Rating Power Consumption IP Rating Condensate Drain Water Content Dry Weight

m m mm
bar (psi)
m
A W
mm l kg

45P

55P

21 Flue / 2 Air 15 Flue / 15 Air

13 Flue / 1 Air
9.5 Flue / 9.5 Air

17 Flue / 2 Air 15 Flue / 15 Air

17 Flue / 1 Air
12.25 Flue / 12.25 Air

2H - G20 20mbar

3P - G20 - 37mbar

2H - G20 20mbar

G 3/4

3P - G20 - 37mbar

G 1 1/4

6.0 (87.0)

61.0

230V - 50Hz

4.0

180

202

262

239

IP20

5.0

60.3

British Built Since 2013

keston.co.uk

INSTALLATION WITH MULTI BOILER LOW LOSS HEADER INSTALLATIONS

SINGLE KESTON HEAT BOILER WITH

LOW LOSS HEADER

Heat boiler

If the system has or requires an additional circulation pump, the Keston Heat model must be fitted as shown in the diagram below, with the inclusion of a Low Loss Header.

Multiple heating circuits can be added with the appropriate controls. The installation of a suitably sized dirt separator in the return pipework to the low loss header is recommended, particularly in the case of old systems.

Low Loss Header System Pump

MODULATING SEQUENCER

INSTALLER FEATURES

The modulating sequence controller is designed to control Keston boilers operating in cascade. An OpenTherm interface is used for the exchange of data between the controller and the boilers. The requested load is transmitted to each boiler separately. The setpoint flow temperature is determined from a heating curve, or from the setpoint flow temperature from an OpenTherm room thermostat. The Controller is also capable of being used in combination with:
1. Programmable Room Thermostat Kit
2. On/Off room thermostat, in addition to this, the Controller can also actuate a hot water storage circuit or a pump circuit.

· Each module can control up to 5 boilers (20 in total with 4 modules)
· OpenTherm BMS compatible as standard
· Can use OpenTherm to gateway adaptors (Bac Net etc)
· Can support weather compensation with the supplied outside sensor configured
· Additional control with the addition of Plant room sensor/room sensor (modulation taken from central point in building or can be set up as a plant room high temp limit)
· Can support hot water with an addition of tank sensor

3. OpenTherm compatable BMS
The universal design of the system, the consistent menu structure and the simple operation enables the installer to commission the controller quickly.

CUSTOMER FEATURES
· Date & time · Daylight saving · Hours run & pulse counters · Data logger (48 hrs storage with 5 min interval) · Fault detection · Restore factory settings

British Built Since 2013

SYSTEM IN CASCADE
Systems that require a heat load greater than the output of a single boiler capacity can be easily achieved by fitting the required number of units in cascade. The Keston Heat range has a turndown rate of 5:1 allowing system requirements to be easily matched.
In installations where the heat load is greater than the boiler capacity an ideal solution is to use multiple boiler arrangements.
Use Varican modules to control all boilers on a cascade through a Master and Slave set up. See page opposite for more details.

Legend

1. Non-return valve

2. Safety valve

3. Service valve

4. Mixing header

5. System pump

6. Modulating Sequencer kit complete

with outdoor sensor and flow

sensor

7. Flue gas terminal

8. Drain cock

9. Room sensor

4 65

Keston can also supply a cascade controller for up to 5 boilers, for total system outputs of up to 275kW. The control unit is also capable of controlling the domestic hot water via a separate hot water cylinder.

keston.co.uk

FRAME AND HEADER KITS

Install Up To 6 Boilers in Cascade with Keston Heat Frame and Header Kits.
The Keston Heat Frame and Header kits offer a simple system installation allowing for outputs from 90kW to 330kW

THE FACTS
Small footprint · 560mm depth for all variants of the Keston
Heat frame and header, with boilers in cascade
· Standard Height and Low Height (4 boiler maximum cascade) frames available
Low lift weight · Lift weights are as low as possible
Time saving · The flow and return and the low loss header
are pre insulated which improves efficiency and reduces heat loss, as well as reducing installation time
Controls · The Frame and Header Kit can be installed
with either a Keston Sequencer (up to 5 boilers) offering direct modulation of the system, which reduces running costs
· For installation of 6 boilers, two Keston sequencers are required

FLEXIBILITY OF SITING
Flue system · The twin flue system allows awkward and
difficult to site flue runs up to 21m*
· Simple 50mm muPVC (PVC-C)** solvent weld flue reduces time, cost and labour
· For increased flexibility of siting, additional elbows and bends are available for both flue systems
· Only 1m reduction in equivalent flue length per 90° bend
· Gas pressure test point fitted to both ends of the gas header to allow left or right hand installation

KESTON HEAT
Frame & Header Accessories

CHOOSE A FRAME KIT
Standard Height Up to 6 boilers
355013 1 frame required per boiler i.e. a 6 boiler cascade requires 6 frames
Low Height Inline Up to 4 boilers
Included with Low Height Header Kit
Boilers not included with Frame or Header Kits; please remember to add them to your order.

CHOOSE A HEADER KIT
Standard Height Frame
2 boilers (DN80) 355084
2 boilers (DN100) 355111
3 boilers (DN80) 355085
3 boilers (DN100) 355112
4 boilers (DN100) 355087
5 boilers (DN100) 355087
6 boilers (DN100) 219546
6 boilers (DN150) 355088
Low Height Frame
1 boiler (DN50) 355093
2 boilers (DN65) 355094
3 boilers (DN80) 355095
4 boilers (DN100) 355096

CHOOSE HYDRAULIC SEPARATION
Low Loss / Mixing Header
DN50 355090
DN65 355091
DN80 355019
DN100 355092

* For the maximum total equivalent flue length, please refer to the installation manual. ** The only systems approved for this application are: Marley muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe System 2000 muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe Terrain Solvent Weld System (50mm) and Wavin Osma PVC-C Solvent Weld System (50mm). Please use the recommended Solvent Weld Cement for each system. Please see page 9 for more details.

British Built Since 2013

keston.co.uk

KESTON SYSTEM
30kW Output
26

7
British Built Since 2013

High SEDBUK efficiency rating and easy to install.
Keston System boiler provides a simple and reliable solution for a wide variety of sealed domestic systems.
Available with a 30kW output, Keston System provides a dependable and efficient solution for new and replacement installations. Time saving push & clip flue spigot connections and a wide range of alternative flueing solutions help to ensure the product is installed quickly in virtually any domestic situation.
With a lightweight design, concealed connections at the base and no compartment ventilation required, Keston System can be conveniently fitted out of sight into a standard kitchen cupboard*.
Complete with a 7 year parts and labour warranty, Keston System boiler provides simple heating control, all from a single compact appliance.

THE FACTS · 7 year warranty
· Easy to see pressure gauge
· L arge backlit display with user friendly controls
· Low lift weight
· L ow component count maximising reliability
· Compact dimensions
· Twin flue up to 27m**
· 5 0mm muPVC (PVC-C) solvent weld flue allowing simple, cost effective installations***
· W eather compensation supplied as standard
· Inbuilt frost protection
· Fully modulating
· LPG conversion kit available

7
INSTALL THE KESTON 22MM SYSTEM FILTER
with a Keston System boiler to receive a 7 year warranty

7 YEAR WARRANTY Providing ultimate

reliability, Keston System

boilers are offered with

a 7 year warranty when

fitted with a Keston 22mm

System Filter

TWIN FLUE DESIGN Providing the perfect solution for problematic and awkward installations
WEATHER COMPENSATOR All models in the Keston range come complete with weather compensation as standard
BRITISH BUILT SINCE 2013 All Keston boilers are built in and designed for the British market

7 year warranty when installed with a Keston 22mm System Filter and registered within 30 days of installation. 5 year parts & labour warranty as standard. 7 year warranty available until 31/12/20. Terms and conditions apply. * Please check cupboard size prior to installation ** For the maximum total equivalent flue length, please refer to the installation manual. *** The only systems approved for this application are: Marley muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe System 2000 muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe Terrain Solvent Weld System (50mm) and Wavin Osma PVC-C Solvent Weld System (50mm). Please use the recommended Solvent Weld Cement for each system. Please see page 9 for more details.

keston.co.uk

FLUE INSTALLATION

Air Pipe Length [m]

Keston System S30 - Flue & Air Pipe Length

4m 1.5 6m

Flue Pipe Length [m]
acceptable flue operating area
Graph indicates maximum flue run 27m with 2m air. Also, 18m flue with 18m air pipe for parallel twin flue run.

6m
1.5m 2m
1m
1.5

C53 HORIZONTAL
Calculations Flue Elbows 3 x 1m = 3m Straights 4+6+1.5+1 = 12.5m Total = 15.5m Air Elbows 2 x 1m = 2m Straights 6+2+0.1+1 = 8.1m Total = 10.1m
C13 HORIZONTAL
Calculations Flue Elbows 3 x 1m = 3m Straights 4+3.5+1.5+2.5 = 11.5m Total = 14.5m Air Elbows 4 x 1m = 4m Straights 2+2+3.5+4+0.15 = 11.65m Total = 15.65m

DIMENSIONS

22.5.5

2.5

22.5.5

2.5

frforommccaasseefrom case

6622

339955 395 62 119988 198

3300mmmm 30mm MMininimimuummTMToopinpiCmCleuleamararTanoncpceeClearance
11555 155

AAirir FFluAlueire Flue

8899

77000 700

44000 400

11000** 100 *

KESTON SYSTEM

Height

700mm

Width

395mm

Depth

278mm

The following minimum clearances must be
maintained for operation and servicing. Front of boiler - 450mm
Sides of boiler - 2.5mm
Above boiler - 30mm above the flue Below boiler - 100mm

Or equivalent length. Can be reduced to 5mm

for

cupboard

fit,

450mm

required

for

servicing.

British Built Since 2013

keston.co.uk

SPECIFICATION DATA

CENTRAL HEATING

CH Output @ 70°C CH Output @ 40°C CH Input CH Input CH Gas Consumption

Max Min Max Min Nett CV Max Nett CV Min Gross CV Max Gross CV Min Max Min

kW kW kW kW kW kW kW kW m3/h m3/h

S30 30.3 6.1 31.0 6.4 30.4 6.1 33.7 6.7 3.135 0.622

OTHERS

Seasonal Efficiency
Seasonal Space Heating Efficiency Class NOx Classification

SEDBUK 2005

SEDBUK 2009

S30 91.1 89.6 A Class 5

GENERAL DATA

Max Horizontal Flue Length Max Horizontal Flue Length (Parallel) Flue Terminal Diameter Gas Supply Gas Supply Connection Injector Size Flow Connection (CH) Return Connection (CH) Average Flue Temp - Mass Flow Rate CO2 Content (±0.7) (Max CH) CO2 Content (±0.7) (Min CH) Max Working Pressure (Sealed Systems) Electrical Supply Power Consumption Fuse Rating Water Content Weight (Packed) Maximum Installation Weight

m m mm
mm
% % bar (psi) W
l (gal) kg kg

S30 27 Flue / 2 Air 18 Flue / 18 Air
50 2H - G20 - 20mbar 15mm copper compression
4.65 22mm copper compression 22mm copper compression
69°C - 13g/s 9.3 8.8
2.5 (36.3) 230V - 50Hz
100 External 3A / Internal: T4A HRC L250V
1.2 (0.26) 31.6 26.2

British Built Since 2013

keston.co.uk

KESTON COMBI
30kW & 35kW Output
32

7
British Built Since 2013

Complete hassle-free home comfort from a single compact appliance.
Offering first-class comfort in a compact, wall-hung appliance small enough to fit inside a standard kitchen cupboard*, the Keston Combi range enables heating and hot water to be controlled independently, ensuring maximum comfort and efficiency.
Keston Combi can be sited almost anywhere in the home, without the need for a separate tank. And because it connects to the unique Keston Twin Flue system, the boiler can be situated anywhere up to 27** metres from the flue outlet, helping to provide further flexibility when required.
Fully modulating, and with weather compensation, Keston Combi provides excellent energy savings, making it the perfect choice for new or replacement installations alike.

THE FACTS · 7 year warranty
· Easy to see pressure gauge
· L arge backlit display with user friendly controls
· Low lift weight
· L ow component count maximising reliability
· Compact dimensions
· Twin flue up to 27m**
· 5 0mm muPVC (PVC-C) solvent weld flue allowing simple, cost effective installations***
· W eather compensator supplied as standard making Keston Combi Boiler Plus compliant out of the box
· Pre-fitted filling loop
· Inbuilt frost protection
· Fully modulating
· LPG conversion kit available

7
INSTALL THE KESTON 22MM SYSTEM FILTER
with a Keston Combi boiler to receive a 7 year warranty

keston.co.uk

7 YEAR WARRANTY
Providing ultimate

reliability, Keston Combi

boilers are offered with

a 7 year warranty when

fitted with a Keston 22mm

System Filter

TWIN FLUE DESIGN
Providing the perfect solution for problematic and awkward installations
WEATHER COMPENSATOR
All models in the Keston range come complete with weather compensation as standard
BRITISH BUILT SINCE 2013
All Keston boilers are built in and designed for the British market

7 year warranty when installed with a Keston 22mm System Filter and registered within 30 days of installation. 5 year parts & labour warranty as standard. 7 year warranty available until 31/12/20. Terms and conditions apply.* Please check cupboard size prior to installation.** For the maximum total equivalent flue length, please refer to the installation manual.*** The only systems approved for this application are: Marley muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe System 2000 muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe Terrain Solvent Weld System (50mm) and Wavin Osma PVC-C Solvent Weld System (50mm). Please use the recommended Solvent Weld Cement for each system. Please see page 9 for more details.
33

FLUE INSTALLATION

DIMENSIONS

Air Pipe Length [m]

Keston Combi C30 - Flue & Air Pipe Length

4m 1.5

Flue Pipe Length [m]
acceptable flue operating area
Graph indicates maximum flue run 27m with 2m air. Also, 18m flue with 18m air pipe for parallel twin flue run.

6m
1.5m 2m
1m
1.5

C53 HORIZONTAL
Calculations
Flue Elbows 3 x 1m = 3m Straights 4+6+1.5+1 = 12.5m Total = 15.5m
Air Elbows 2 x 1m = 2m Straights 6+2+0.1+1 = 8.1m Total = 10.1m

Air Pipe Length [m]

Keston Combi C35 - Flue & Air Pipe Length
30 26 22 18 14 10
6
2 4 6 8 10 12 14 16 18 20 22 24 26 28 Flue Pipe Length [m]
acceptable flue operating area
Graph indicates maximum flue run 25m with 2m air. Also, 15m flue with 15m air pipe for parallel twin flue run.

C13 HORIZONTAL
Calculations
Flue Elbows 3 x 1m = 3m Straights 4+3.5+1.5+2.5 = 11.5m Total = 14.5m
Air Elbows 4 x 1m = 4m Straights 2+2+3.5+4+0.15 = 11.65m Total = 15.65m

KESTON COMBI

Height

700mm

Width

395mm

Depth

278mm

The following minimum clearances must be
maintained for operation and servicing. Front of boiler - 450mm
Sides of boiler - 2.5mm
Above boiler - 30mm above the flue Below boiler - 100mm

* Or equivalent length. Can be reduced to 5mm for cupboard fit, 450mm required for servicing

British Built Since 2013

keston.co.uk

SPECIFICATION

DATA
CENTRAL HEATING

CH Output @ 70°C CH Output @ 40°C CH Input CH Input CH Gas Consumption

Max Min Max Min Nett CV Max Nett CV Min Gross CV Max Gross CV Min Max Min

kW kW kW kW kW kW kW kW m3/h m3/h

C30 24.2 6.1 25.6 6.4 24.3 6.1 27.0 6.7 2.512 0.623

C35 24.2
7.1 25.6 7.5 24.3
7.1 27.0 7.9 2.512 0.734

HOT WATER

DHW Output

Max

DHW Input

Nett CV Max

DHW Input

Gross CV Max

DHW Gas Consumption

DHW Flow Rate at 35°C Rise

DHW Specific Rate

kW kW kW m3/h
l/min
l/min

C30
30.3 30.4 33.7 3.135 12.4 14.5

C35
35.3 35.4 39.3 3.658 14.5 16.9

OTHERS

C30

C35

Seasonal Efficiency

SEDBUK 2005

SEDBUK 2009

91.1 89.6

Seasonal Space Heating Efficiency Class

NOx Classification

Class 5

British Built Since 2013

GENERAL DATA

Max Horizontal Flue Length Max Horizontal Flue Length (Parallel) Flue Terminal Diameter Gas Supply Gas Supply Connection Injector Size Flow Connection (CH) Return Connection (CH) Inlet Connection (DHW) Outlet Connection (DHW) Average Flue Temp - Mass Flow Rate (DHW) CO2 Content (±0.7) (Max CH) CO2 Content (±0.7) (Max DHW) Max Working Pressure (Sealed Systems)
Max DHW Inlet Pressure
Min DHW Inlet Pressure
Electrical Supply Power Consumption Fuse Rating Water Content (CH) Water Content (DHW) Weight (Packed) Maximum Installation Weight

m m mm
mm
% % bar (psi) bar (psi) (kPa) bar (psi) (kPa)
W
l (gal) l (gal)
kg kg

C30

C35

27 Flue / 2 Air

25 Flue / 2 Air

18 Flue / 18 Air

15 Flue / 15 Air

2H - G20 - 20mbar

15mm copper compression

4.65

4.90

22mm copper compression

15mm copper compression

68°C - 13g/s

73°C - 15g/s

8.8

8.9

9.3

9.5

2.5 (36.3)

10.0 (145) (1000)

1.3 (18.9) (130)

230V - 50Hz

101

114

External 3A / Internal: T4A HRC L250V

1.2 (0.26)

0.5 (0.11)

34.4

34.5

31.4

31.5

keston.co.uk

KESTON SERVICE
Support & aftersales

When you choose a Keston appliance, you are selecting a solution that has been expertly produced to the highest of standards.

SUPPORT When you choose to work with Keston you can be confident to know that you're partnering with a British manufacturer that's supported by a dedicated national service team, delivering help and advice to you and your customers, 364 days a year.
Our rigorous research and development procedures and manufacturing quality control checks ensures that all of our products are produced to the highest of standards, delivering total comfort and peace of mind.
SERVICE Our dedicated service team of engineers are fully trained to exacting standards and are Gas Safe Registered, providing one-to-one advice on the road, over the phone or via the net to thousands of customers each year.
PARTS Keston's extensive quality testing procedures ensure that all of our products are manufactured to the highest of quality standards.
In the unlikely event that a spare part is required, you can be rest assured that most parts are readily available to order via your local spares outlet up to 10 years after appliance production has ceased.
Keston spare parts can be obtained from any of Ideal's nationwide network of approved stockists.

AFTERSALES Supported by a dedicated national service team, delivering help and advice to you and your customers, 364 days a year, all of Keston's products come with their own dedicated warranty. Each product design undergoes a rigorous research and development procedure and manufacturing quality control check to ensure that every product is produced to the highest of standards, helping to deliver total home comfort and peace of mind.
Our call centre team based in Hull are comprehensively trained to provide tailored advice to homeowners and the trade.
Installer helpline & Homeowner helpline
01482 443 005
FOR INFORMATION ABOUT ANY KESTON SPARE PARTS
For a list of stockists, please call our Spares Department or visit our website
www.keston.co.uk
SPARES DEPARTMENT
01482 443 005

British Built Since 2013

keston.co.uk

KESTON TRAINING
Here at Keston, we understand that having the confidence to be able to specify and install a wide range of products is an essential part of your day-to-day job.

With this in mind, we have created a wide range of comprehensive training courses, utilising both classroom and hands-on learning techniques to enable you to become a more efficient, skilled heating engineer.
All of our training courses have been designed to ensure that you get the most out of the time spent off the road and can be easily adapted to suit the desired knowledge level.
So, if you're looking to refresh your existing knowledge, or to learn how to install something completely new, Keston has a course for you.
For more information, please contact the training department on 01482 443 005.
LOCATIONS
Centres of Excellence in Hull, Leeds and Reading.
These are comprehensive one-day courses, which can be mixed and matched for individual installation and servicing companies. The course uses a simple step-bystep approach with hands on training to ensure all aspects of commissioning, servicing and fault finding can be dealt with quickly and efficiently.

COURSE CONTENT Each course covers the following:
Product range overview Product specification Installation requirements Flue and accessory options Component review overview C omponent change and repair User controls Sequence of operation Fault finding
The course involves discussion with tutors, demonstrations with practical advice. Lunch and refreshments are provided and a certificate is awarded upon completion.

If you are an installer/service engineer you must be Gas Safe Registered to attend a course.

British Built Since 2013

keston.co.uk

PPRROODDUUCCTT IINNFFOORRMMAATTIOIONN

BOILER PACKAGED

KESTON SYSTEM 355063 - Keston System S30 Boiler Packaged

KESTON COMBI
355061- Keston Combi C30 Boiler Packaged 355062 - Keston Combi C35 Boiler Packaged

KESTON HEAT
355003 - Keston Heat 45 Boiler Packaged 355004 - Keston Heat 55 Boiler Packaged 355079 - Keston Heat 45P Boiler Packaged 355078 - Keston Heat 55P Boiler Packaged

ACCESSORIES

KESTON SYSTEM
355005 - Keston Twin Combi/System Stand Off Kit 355006 - Keston Air Terminal Finishing Kit 355007 - Keston Flue Sleeve Kit 355081 - Keston System Filter 22mm 355071- Keston System S30 LPG Conversion Kit

KESTON COMBI

KESTON HEAT

355005 - Keston Twin Combi/System Stand Off Kit 355067 - 7 Day Plug in Electronic timer 355066 - RF Electronic Programmable Stat 355006 - Keston Air Terminal Finishing Kit 355007 - Keston Flue Sleeve Kit 355081- Keston System Filter 22mm 355069 - Keston Combi C30 LPG Conversion Kit 355070 - Keston Combi C35 LPG Conversion Kit

355008 - Keston Heat Room Controller 355009 - Keston Heat Modulating Sequencer Kit 355010 - Keston Heat Tank Sensor Kit 355011 - Keston Heat Safety Interlock Kit 355012 - Keston Heat Room Sensor Kit 355006 - Keston Air Terminal Finishing Kit 355082 - Keston System Filter 28mm

FRAME AND HEADER KITS
KESTON HEAT
355013 - Single Frame Standard Height Inline Kit 355089 - Single Frame Low Height Inline Kit 355084 - Header Inline DN80 x 2 Boilers Kit 355085 - Header Inline DN80 x 3 Boilers Kit 355111 - Header Inline DN100 x 2 Boilers Kit 355112 - Header Inline DN100 x 3 Boilers Kit 355086 - Header Inline DN100 x 4 Boilers Kit 355087 - Header Inline DN100 x 5 Boilers Kit 355088 - Header Inline DN100 x 6 Boilers Kit 355093 - Low Height Frame & Header DN50 x 1 Boiler Kit 355094 - Low Height Frame & Header DN65 x 2 Boiler Kit 355095 - Low Height Frame & Header DN80 x 3 Boiler Kit 355096 - Low Height Frame & Header DN100 x 4 Boiler Kit 355090 - Low Loss Header DN50 355091 - Low Loss Header DN65 355019 - Low Loss Header DN80 355092 - Low Loss Header DN100 355097 - Standard Height Flexible Gas Hose 355098 - Low Height Flexible Gas Hose

British Built Since 2013

keston.co.uk

Customer Service:
01482 443005
Technical Help:
01482 443005

Manufactured to the highest UK standards, anything is possible with a Keston.

Keston Heating PO Box 103 National Avenue Kingston Upon Hull HU5 4JN

www.keston.co.uk

In accordance with our policy of constant improvement we reserve the right to alter the design and specification of products without prior notice. Keston business reg : no 03544589
E & OE | Version January 2020 | 211284

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